fix: raise tree-sitter floor to 0.25, test query compilation

[Aman-goel-04]

Summary

• Raise the tree-sitter floor from >=0.23,<1 to >=0.25,<1. 0.23.x/0.24.x fail to compile 13 of 27 language queries (Impossible pattern), silently indexing those languages at zero symbols
• Add a test that compiles every language's query against its registered grammar and asserts the result isn't None, instead of expecting an exception
• Add a CI job that pins tree-sitter to the exact declared floor (0.25.0) and runs that one test, so a future floor regression is caught without a full --resolution lowest-direct job

Related Issues

Fixes #2165

Test Plan

• Tests pass (pytest)
• Lint passes (ruff check .)
• Web build passes (npm run build) (if frontend changes): N/A, no frontend changes

Checklist

• My code follows the project's code style
• I have added tests for new functionality
• All existing tests still pass
• I have updated documentation if needed: N/A, no docs affected